21044124224420 has 72 divisors (see below), whose sum is σ = 51432780910392. Its totient is φ = 7202267100160.

The previous prime is 21044124224407. The next prime is 21044124224467. The reversal of 21044124224420 is 2442242144012.

It can be written as a sum of positive squares in 4 ways, for example, as 1747572953764 + 19296551270656 = 1321958^2 + 4392784^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255721187 + ... + 255803466.

It is an arithmetic number, because the mean of its divisors is an integer number (714344179311).

Almost surely, 2^{21044124224420} is an apocalyptic number.

21044124224420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044124224420 is an abundant number, since it is smaller than the sum of its proper divisors (30388656685972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21044124224420 is a wasteful number, since it uses less digits than its factorization.

21044124224420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511524701 (or 511524688 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 32.

Adding to 21044124224420 its reverse (2442242144012), we get a palindrome (23486366368432).

The spelling of 21044124224420 in words is "twenty-one trillion, forty-four billion, one hundred twenty-four million, two hundred twenty-four thousand, four hundred twenty".